Yoga 2 Pro + Windows 10 = External Monitor not working via micro HDMI

I upgraded to Windows 10 last week and everything was smooth.  Today when rebooting my system, the unit no longer can see my external display.  I have tried multiple other displays and none seem to work.  I have the latest video drivers for Win10 from the support site installed but it still doesn't work.  Any thoughts?

I had issues with extreme sluggisness of my Yoga 2 Pro when I connected my external HDMI monitor after upgrading to win 10. I disabled DPTF in the BIOS and all the issues went away immediately. I have not tested yet what the impact on my battery life will be. Regardless, this is something Lenovo really needs to fix in the driver! If you don't know how to access the BIOS, here is a good link: http://www.howtogeek.com/126016/three-ways-to-access-the-windows-8-boot-options-menu/

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